Paper making machine



March 26, 1935. G. J. FORMAN PAPER MAKING MACHINE Filed Oct. 20, 1934 4 Sheets-Sheet l amen KM N Georye J ormcuv,

March 26, 1935. FQRMAN 1,995,802

PAPER MAKING MACHINE Filed Oct. 20, 1934 4 Sheets-Sheet 2 George J] brman 514/5 Gum/mugs March 26, 1935.

G. J. FORMAN PAPER MAKING MACHINE Filed Oct. 20, 1934 George Jfirnuuz,

4 Sheets-Sheet 5 March 26, 1935. G. J. FORMAN 1,995,802

PAPER MAKING MACHINE Filed Oct. 20, 1954 4 Sheets-Sheet 4 Q s 1% 0 Ty a .Q\ G

gvwcwto'o Geo 7196 JFormwz,

Patented Mar. 26, 1935 PATENT OFFICE PAPER MAKING MACHINE George J. Forman, Montville, Conn.

Application October 20,

12 Claims.

This invention relates to improvements in paper making machines and particularly to that type of 1 uid paper stock supplied to a vat within which the d ferentially of the cylinder.

cylinder is located.

One object of the present invention is to provide a cylinder paper machine, wherein the liquid of the stock is removed from the web formed on the cylinderby the combined, but successively exerted, forces of gravity, vacuum and pressure.

A further object contemplated is the provision of a cylinder machine capable of producing paper of two separately supplied paper stocks. In this connection, means are provided for recovering separately the liquid of the two stocks so that such liquid may be used again in subsequent stock supply without the necessity of removing foreign matter therefrom.

More specifically, the invention contemplates a machine comprising a vat with a perforated, rotating cylinder extending therethrough with connections for supplying two different liquid paper stocks to the vat at points spaced circum- The major portion of the liquid drains by gravity through the cylinder perforations to a compartment within the lower portion of the cylinder, in which compartment there is a partition which substantially retains the liquid of the two stocks separated. The liquid of each stock is recovered from the interior of the cylinder and reused. Above the compartment and within the cylinder, there is a vacuum box, one wall of which is formed by the cylinder, so that substantially all of the liquid not removed by gravity will be removed under the influence of the vacuum. In order to further insure against excessive quantities of liquid remaining in the paper web at the time it leaves the surface of the cylinder, a plurality of pressure or couch rolls are associated with that portion of the surface of the cylinder that constitutes a wall of vacuum box. These rolls serve to express into the box any liquid remaining in the web.

With these an other objects in view, the invention consists in certain details of construction and combinations and arrangements of parts, all as will hereinafter be more fully described and the novel features thereof particularly pointed out in the appended claims.

In the accompanying drawings, illustrating the preferred embodiment of the invention Figure 1 is a plan view;

1934, Serial No. 749,298 (01. 92-43) Fig. 2 is a vertical longitudinal section on the line 22 of Fig. 1;

Fig. 3 is a vertical transverse section on the line 3-3 of Fig. 1;

Fig. 4 is a detail section, taken longitudinally 5 .of the cylinder illustrating the air blast device for facilitating transfer of the web of paper from the cylinder to the web conveyor felt;

Fig. 5 is a sectional view on the line 5-5 of Fig. 2;

Fig. 6 is a view, partly in section, taken transversely of one end of the forming cylinder;

Fig. '7 is an elevational view of the forming cylinder, .a portion of the wire cloth covering thereof being shown broken away;

Fig. 8 is a detail sectional view showing the application of the wire cloth covering to the cylinder.

The cylinder 10 formed with perforations 11 in its intermediate portion but with imperforate end portions, extends through the vat 12, the imperforate end portions projecting beyond the boundaries of the vat. Preferably, the surface of the cylinder is formed with a spiral groove 13 to facilitate securing a wire mesh covering 14 on the cylinder by means of a wire 15 wound spirally around the cylinder in said groove. The cylinder is adapted to be rotated from a shaft 16 connected to any suitable source of power, the shaft 16 having a bevel gear 1'7 meshing with a like gear 18 on a shaft 19 which also carries a gear 20 meshing with a gear 21 on the cylinder. Endwise motion of the cylinder is prevented by means of ways 22 formed thereon in which guide rollers 23 engage.

The present machine is especially designed for the production of webs of paper made of two different stocks and for this reason, the vat is' adapted to be supplied with liquid paper stock through the two inlets 24, 25, these inlets being so disposed as to supply the two stocks to the vat at points spaced circumferentially of the cylinder. Each inlet pipe communicates with a regulating box or reservoir 26, and in each of said boxes, there is a regulating board 27 which may 45 be raised or lowered to control the flow of stock through the box and thus regulate the uniformity of the web of paper formed on the cylinder. The cylinder is spaced from the bottom of the vat only a distance sufficient to accommodate the web of paper being formed, so that the cylinder substantially divides the vat into two chambers, each of which is supplied by stock through one of the supply pipes 24 or 25.

As ordinarily occurs in machines of this type, 55

the fibres of the stock are disposed on the surface of the wire mesh covering of the cylinder, but in the present machine the forces of gravity, vacuum and pressure are all utilized in extracting the liquid from the stock so as to have the web of paper as dry as possible at the time it leaves the surface of the cylinder. For this purpose, the interior of the cylinder is made perfectly plain and the major portion of its interior, including the lower portion thereof, constitutes a compartment into which the liquids of the stock will drain by gravity through the perforations in the cylinder. Above this compartment, there is a vacuum chamber 28 connected to suitable exhaust devices by conduit 29. It will be seen that due to the plain surface of the interior of the cylinder, only a small packing 30 is required to gain the full effect of the vacuum created in chamber 28. This vacuum chamber is formed by a plate 31 supported within the interior of the cylinder by longitudinal members 32 which project beyond the ends of the cylinder, and are secured in standards 33. The end walls 34 of the vacuum chamber extend into close proximity to the wall of the cylinder and the latter constitutes one of the walls of said vacuum chamber. The area of the cylinder affected by the vacuum is quite large, in order that a plurality of pressure or couch rolls may be utilized for expressing liquid from the web formed on the cylinder. As shown in Fig. 3, after any portion of the paper web on the cylinder passes above the bottom wall of the vacuum chamber, liquid not previously drained therefrom by gravity will be extracted by reason of the vacuum in chamber 28. That is, substantially all the liquid will be extracted, but to insure a substantially dry web, there are a plurality of couch rolls 34 adapted to engage the web while it is still under the influence of the vacuum. Preferably, the couch rolls are pivotally supported in an overhanging frame 35, so that the pressure exerted thereby on the web can be varied. With this arrangement, the major portion of the liquid in the stock will drain by gravity into the lower portion of the cylinder; next, additional liquid will be extracted from the web by the vacuum in chamber 28; and, finally, practically all of the remaining liquid will be extracted by the combined efforts, so to speak, of the vacuum chamber and couch rolls.

Preferably, a felt 36 passes over the series of couch rolls and serves as a conveyor in connection with the removal of the web of paper from the cylinder. To facilitate transfer of the web of paper from the cylinder to the felt, a pipe 37 may be placed within the cylinder, longitudinally thereof, and an air blast projected therefrom through the perforations in the cylinder at a point where the blast of air will tend to force the web of paper ontothe felt at the point where the latter passes around the last of the couch rolls. The web is removed from the felt by top press roll 38 and, as is quite customary the felt is passed over the surface of a vacuum chamber 39 as it approaches the cylinder in order to remove liquid therefrom, so that the felt will be as dry as possible when it engages the web on the cylinder. As heretofore mentioned, the present machine is designed for producing paper from different stocks. Hence, it is desirable to keep separate, as far as possible, the liquid of the two stocks. For this purpose, the interior of the cylinder to which the liquid from the stocks drains is substantially divided into two chambers by a partition 40 extending longitudinally of the interior of the cylinder in the lower portion thereof. Thus, the liquid from stock supplied through inlet 24 will be retained on one side of the partition 40 and the liquid from the stock supplied through inlet 25 retained on the other side of said partition. At its ends, the partition 40 is provided with means for regulating the height of liquid desired on each side of the partition. That is, the discharge of the liquids from the ends of the cylinder can be restricted to cause the liquid to back up to some extent within the cylinder. This is desirable where different colors or different stocks are being used because it permits the foundation fibers to form first on the cylinder. These regulating means consist of gates 41 pivotaily mounted at 42, their free ends being engaged by screws 43 whereby said free ends may be adjusted toward or from the partition 40 to restrict or enlarge the passage through which liquid discharged from the end of the cylinder flows. At each end of the cylinder, receptacles 44, 45, are provided for receiving the liquids discharged from the cylinder. Each receptacle is provided with an outlet 46, through which the liquid can be drawn and returned, if desired, to the point where it is again mixed with stock and each of said receptacles is also provided with an overflow drain pipe 47, the discharge of liquid through the overflow pipe being controlled by a gate valve 48 adjustable vertically to regulate the volume of liquid retained in the receptacle and the volume of liquid permitted to overflow.

From the foregoing, it will be seen that paper may be formed from two different stocks and the liquid of each stock recovered separately, so that it can be again used without the necessity of preliminarily extracting foreign matter therefrom. Also, by utilizing the combined forces of gravity, vacuum and pressure, the liquid is extracted from the web of paper as nearly completely as it is possible before the web of paper leaves the cylinder.

It is preferred that a suflicient number of baflle boards 49 be used in the receiving tanks 26 of the vat in order to secure the uniformity of flow to the cylinder mold. Also, suitable packing 50 should be used at the ends of the vat against the exterior surface of the cylinder to prevent loss of stock.

What I claim is:

1. In a paper making machine the combination of a vat, a cylinder extending through said vat with its ends projecting beyond the vat, the portion of the cylinder within the vat being perforated and substantially dividing the vat into two chambers, separate means for supplying paper stock to each of said chambers, means for creating a vacuum at the inner surface of the cylinder above the vat, and couch rolls operatively associated with the periphery of the cylinder.

2. In a paper making machine, the combination of a vat, a rotatable cylinder extending through the vat with its ends projecting beyond the vat, the portion of the cylinder within the vat being perforated, means for supplying separate paper stocks to the vat at points spaced circumferentially of the cylinder, means for retaining the water from each stock separate within the cylinder, and means for removing the web of paper from said cylinder.

3. In a paper making machine, the combination of a vat, a rotatable, perforated cylinder within said vat, means for supplying two different paper stocks to said vat at points spaced circumferentially of the cylinder to form a web of paper thereon, and means for keeping the water of the two stocks separated within the cylinder.

4. In a paper making machine, a vat, a perforated cylinder rotatable within said vat, means for supplying two different paper stocks to the vat at points spaced circumferentially of the cylinder, means for retaining the water of the two stocks separated within the cylinder, and means for varying the depth of water retained in the cylinder.

5. In a paper making machine, a vat, a perforated cylinder rotatable within said vat, a partition extending longitudinally of the interior of the cylinder, and means for supplying two different paper stocks to the vat at opposite sides of said partition.

6. In a paper making machine, a vat, a perforated cylinder rotatable within the vat, means for supplying two different paper stocks to the vat at points spaced circumferentially of the cylinder. a partition extending longitudinally of the interior of the cylinder intermediate said points of stock supply, whereby water of the two stocks passing into the cylinder will be separated, and valve members carried by said partition for controlling the discharge of water from the cylinder.

'7. In a paper making machine, a vat, a rotatable cylinder extending through the vat, said cylinder having perforations therein within the vat and imperforate ends exterior of said vat, means for supplying two different paper stocks to the vat at points spaced circumferentially of the cylinder, means within the vat for keeping the water from the two stocks separated, receptacles at the ends of the cylinder for receiving the water discharged from the cylinder, a discharge connection for each receptacle, and an overflow for each receptacle.

8. In a paper making machine, a vat, a perforated cylinder rotatable in the vat, means for supplying separate liquid paper stocks to said vat, and means for separately recovering the liquid of the two stocks passing within the cylinder.

9. In a paper making machine, the combination of a vat, a perforated, rotatable cylinder extending through said vat, separate inlets for supplying liquid paper stock to the vat at points spaced circumferentially of the cylinder, means for draining liquid passing through the cylinder perforations by gravity from said cylinder, said cylinder having imperforate ends projecting beyond the vat and serving to feed said drain means, vacuum means on the interior of the cylinder for extracting liquid from the stock, and pressure means at the exterior of the cylinder for further removing liquid from the stock.

10. In a paper making machine, a vat, a rctatable, perforated cylinder extending through the vat, separate stock supply means for supplying liquid paper stock to the vat at points spaced circumferentially of the cylinder, said cylinder having a compartment within the interior thereof into which liquid of the stock flows by gravity through the cylinder perforations, means for recovering liquid from said compartment, said cylinder having imperforate ends projecting beyond the vat and serving to feed said recovering means, vacuum means above said compartment within the cylinder for further extracting liquid from stock on the cylinder, and couch rolls associated with the exterior of the cylinder for expressing liquid from stock on the cylinder.

11. In a paper making machine, a vat, a rotatable, perforated cylinder extending through the vat, separate stock supply means for supplying liquid paper stock to the vat at points spaced circumferentially of the cylinder, said cylinder having a compartment within the interior thereof into which liquid of the stock flows by gravity through the cylinder perforations, means for recovering liquid from said compartment, said cylinder having imperforate ends projecting beyond the vat and serving to feed said recovering means, a vacuum chamber within the cylinder above said compartment, one wall of said chamber being formed by the cylinder wall whereby liquid is extracted from stock on the cylinder by vacuum, and a series of couch rolls associated with the exterior of that portion of the cylinder constituting the vacuum chamber wall.

12. In a paper making machine, a vat, a rotatable, perforated cylinder extending through said vat, separate stock supply means for supplying two diiferent liquid paper stocks to the vat at points spaced circumferentially of the cylinder, a compartment within the cylinder into which liquid of the stock flows by gravity through the perforations of the cylinder, means within the compartment for maintaining the liquid of the two stocks separate, means for separately recovering the drained liquid of the two stocks, said cylinder having imperforate ends projecting beyond the vat and serving to feed said recovering means, a vacuum chamber within the cylinder above said compartment, one wall of said chamber being formed by the cylinder wall whereby liquid is extracted from the stock on the cylinder by vacuum, and a series of couch rolls associated with the exterior of that portion of the cylinder constituting said vacuum chamber wall.

GEORGE J. FORMAN. 

